Buggy code:
public class Static { public static double getNumber ( Construct c ) { } public static double getDouble ( Construct c ) { } public static long getInt ( Construct c ) { } public static boolean getBoolean ( Construct c ) { } public static boolean anyDoubles ( Construct ... c ) { } public static boolean anyStrings ( Construct ... c ) { } public static boolean anyBooleans ( Construct ... c ) { } public static Logger getLogger ( ) throws NotInitializedYetException { } public static MCServer getServer ( ) throws NotInitializedYetException { } public static AliasCore getAliasCore ( ) throws NotInitializedYetException { } public static SerializedPersistance getPersistance ( ) throws NotInitializedYetException { } public static PermissionsResolverManager getPermissionsResolverManager ( ) throws NotInitializedYetException { } public static Version getVersion ( ) throws NotInitializedYetException { } public static Preferences getPreferences ( ) throws NotInitializedYetException { } private static String debugLogFileCurrent = null ; private static FileWriter debugLogFileHandle = null ; public static FileWriter debugLogFile ( ) throws IOException { } private static String standardLogFileCurrent = null ; private static FileWriter standardLogFileHandle = null ; public static FileWriter standardLogFile ( ) throws IOException { } private static String profilingLogFileCurrent = null ; private static FileWriter profilingLogFileHandle = null ; public static FileWriter profilingLogFile ( ) throws IOException { } public static String ParseCalendarNotation ( String name ) { } public static String ParseCalendarNotation ( String name , Calendar c ) { } public static WorldEditPlugin getWorldEditPlugin ( int line_num , File file ) { } public static WorldGuardPlugin getWorldGuardPlugin ( int line_num , File file ) { } public static void checkPlugin ( String name , int line_number , File f ) throws ConfigRuntimeException { } public static Construct resolveConstruct ( String val , int line_num , File file ) { } public static Construct resolveDollarVar ( Construct variable , List < Variable > vars ) { } public static void SendMessage ( LineCallback c , String msg ) { } public static void SendMessage ( final MCCommandSender m , String msg , final int line_num , final File f ) { } public static void SendMessage ( final MCCommandSender m , String msg ) { } public static boolean CheckSecurity ( String location ) { } public static boolean ApparentURL ( String toCheck ) { } public static MCItemStack ParseItemNotation ( String functionName , String notation , int qty , int line_num , File f ) { } public static String ParseItemNotation ( MCItemStack is ) { } public static String ParseItemNotation ( MCBlock b ) { <START_BUG> if ( b == null ) { <END_BUG> return "0" ; } return ( b . getTypeId ( ) ) + ( ( b . getData ( ) ) == 0 ? "" : ":" + ( Byte . toString ( b . getData ( ) ) ) ) ; } public static MCPlayer GetPlayer ( String player , int line_num , File f ) throws ConfigRuntimeException { } public static MCPlayer GetPlayer ( Construct player , int line_num , File f ) throws ConfigRuntimeException { } public static MCPlayer GetPlayer ( String player ) { } public static MCPlayer GetPlayer ( Construct player ) { } public static MCLocation GetLocation ( Construct c , MCWorld w , int line_num , File f ) { } public static CArray GetLocationArray ( MCLocation l ) { } public static boolean isNull ( Construct construct ) { } public static int Normalize ( int i , int min , int max ) { } public static MCEntity getEntity ( int id ) { } public static String strJoin ( Collection c , String inner ) { } public static String strJoin ( Object [ ] o , String inner ) { } public static String LF ( ) { } public static synchronized void LogDebug ( String message ) throws IOException { } public static void QuickAppend ( FileWriter f , String message ) throws IOException { } public static void PlayDirty ( ) { } public static boolean hasCHPermission ( String functionName , Env env ) { } public static String Logo ( ) { } public static String DataManagerLogo ( ) { } }

Fix:
if ( ( b == null ) || ( b . isNull ( ) ) ) {